Improved structure of lithium battery

Abstract

The utility model relates to a lithium battery improved structure belongs to battery technical field, and this structure aims at the problem that the battery group stability is insufficient because of the small contact surface when traditional cylindrical lithium battery is in parallel, and realizes the improvement through the following technical scheme: the inner wall of metal cylindrical shell sets up axial inner block, and the excess fit with the outer wall of battery cell is formed, the bottom surface of cap sets up the embedded block and inserts the clearance between adjacent inner blocks, and the limiting piece is embedded in the limiting hole of the top of shell, and the extension of the end of limiting piece forms the plug -in structure with adjacent battery in the limiting hole, and the limiting piece is welded and fixed with shell, and the length of the extension of part limiting piece is greater than the depth of limiting hole, so that the extension limiting piece of adjacent unit can be mutually embedded when the battery is assembled, and the utility model discloses a structure through increasing the contact surface of shell and battery cell, the limiting mode of cap and shell and improving the connecting structure between batteries, effectively improves the internal structure stability of single battery and the assembly stability of battery group.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an improved structure for lithium batteries. Background Technology

[0002] Cylindrical lithium batteries are widely used in electric vehicles, consumer electronics, and energy storage systems due to their high energy density and good cycle life.

[0003] However, there are still areas for improvement in the structure of traditional cylindrical lithium batteries: when connecting multiple small cylindrical batteries to form a large battery pack, a parallel connection is usually used, connecting the positive and negative terminals of all batteries to form a parallel circuit, so that the current is added together while the voltage remains constant. However, due to the small contact area between adjacent batteries caused by the cylindrical design, the stability of the battery pack is defective in actual use. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies where the cylindrical design results in a small contact area between adjacent batteries, leading to instability in battery packs during actual use. This invention proposes an improved lithium battery structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An improved lithium battery structure includes a housing, which is a cylindrical metal body with multiple axially extending inner protrusions on its inner wall.

[0007] The battery cell is coaxially disposed inside the housing, and the outer wall of the battery cell is interference-fitted with the inner surface of the inner protrusion.

[0008] A cap covers the opening of the outer shell, and its bottom surface is provided with a plurality of inserts, which are inserted between two adjacent inner protrusions;

[0009] as well as,

[0010] A limiting block is fixedly disposed on the radial outer side of at least two inserts;

[0011] A limiting hole is provided on the top of the outer shell, and the limiting block is partially embedded in the limiting hole and welded and fixed to the outer shell;

[0012] The end of the limiting block extending out of the limiting hole is configured to be inserted into the limiting hole of the adjacent battery.

[0013] In one possible design, the bottom of the battery cell is fixedly connected to the inner bottom surface of the casing by circumferentially distributed resistance solder joints.

[0014] In one possible design, the edge of the cap is sealed to the opening of the outer shell by an annular laser weld, and the central area of ​​the cap is connected to the positive electrode tab of the battery cell by spot welding.

[0015] In one possible design, a fluororubber sealing ring is provided between the outer shell and the cap.

[0016] In one possible design, the four limiting blocks are equidistantly distributed on the bottom surface of the cap, wherein the extension length of two of the limiting blocks is greater than the depth of the limiting hole.

[0017] In this application, during actual use, the battery cell is inserted into the casing by vertical pressing, and the bottom of the battery cell is fixed to the casing by bottom welding. The cap is placed on the end of the casing, and the limiting block on the bottom surface is located between two adjacent inner protrusions. At the same time, the four limiting blocks are located inside the four limiting holes respectively. The cap is connected to the positive electrode tab of the battery cell by laser welding and sealed to the casing by laser welding. The limiting blocks located inside the limiting holes are also welded and fixed to the casing. When multiple casings are assembled in parallel to increase the total current or capacity of the battery pack, the limiting blocks located inside the limiting holes protruding from the battery surface will be embedded inside the limiting holes of adjacent batteries, thereby increasing the stability of the connection between the two.

[0018] In this utility model, the improved lithium battery structure, through the internal protrusions and inserts, can both increase the friction between the outer shell and the battery cell, thereby improving the stability of the battery cell inside, and increase the limiting between the outer shell and the cap, ensuring the stability between the two.

[0019] In this utility model, the improved lithium battery structure, through the limiting block, can increase the contact surface between the outer shell and the cap, thereby increasing the welding area and thus increasing the stability between the two. At the same time, it can also increase the contact surface between two batteries when assembling a battery pack, thereby ensuring the stability of its assembly.

[0020] In this invention, the contact surface between the outer casing and the battery cell, as well as between the outer casing and the cap, can be increased during use, thereby ensuring a stable connection between adjacent components. Additionally, during battery pack assembly, adjacent batteries can be interlocked, thus improving the stability of the assembled battery pack. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of an improved lithium battery structure proposed in this utility model;

[0022] Figure 2 This is an exploded top view of an improved lithium battery structure proposed in this utility model;

[0023] Figure 3This is a schematic diagram of the exploded, bottom-view structure of an improved lithium battery structure proposed in this utility model.

[0024] In the diagram: 1. Outer shell; 2. Cap; 3. Inner protrusion; 4. Battery cell; 5. Limiting block; 6. Insert; 7. Limiting hole. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Example 1

[0027] Reference Figure 1-2 An improved structure includes: a cylindrical outer shell 1, a circular cap 2, and a cylindrical battery cell 4.

[0028] The outer casing 1 is made of metal, and its inner wall has multiple inner protrusions 3 arranged at equal intervals along the axial direction. The inner protrusions 3 and the outer casing 1 are integrally formed, and the inner protrusions 3 are in close contact with the outer wall of the battery cell 4. By increasing the friction between the outer casing 1 and the battery cell 4, the stability of the battery cell 4 inside is improved. The battery cell 4 is installed into the outer casing 1 by vertical pressing, and its bottom is fixedly connected to the inner bottom surface of the outer casing 1 by resistance bottom welding process. The welding points are evenly distributed circumferentially.

[0029] The cap 2 is connected to the positive electrode tab on the top of the cell 4 by a continuous laser welding process, and the edge of the cap 2 is sealed to the opening of the outer shell 1 by annular laser welding.

[0030] A fluororubber sealing ring is sandwiched between the cap 2 and the outer shell 1.

[0031] This application can be used in the field of batteries, or in other fields applicable to this application.

[0032] Example 2

[0033] refer to Figure 3 Based on Embodiment 1, an improved lithium battery structure is proposed for application in the battery field. Multiple inserts 6 are equidistantly arranged circumferentially on the lower surface of the cap 2, with each insert 6 located between two adjacent inner protrusions 3 below, thereby limiting the position between the outer shell 1 and the cap 2. Four equally spaced inserts 6 have limiting blocks 5 fixed to their sidewalls. Four limiting holes 7 are correspondingly opened on the top of the outer shell 1. The limiting blocks 5 located inside the limiting holes 7 are also welded and fixed to the outer shell 1, increasing the welding area to enhance the stability between the two.

[0034] Two adjacent limiting blocks 5 have their ends located outside the limiting hole 7, while the ends of the other two adjacent limiting blocks 5 are located inside the limiting hole 7. This allows multiple housings 1 to be assembled in parallel to increase the total current or capacity of the battery pack. The limiting blocks 5 that protrude from the limiting hole 7 on the battery surface will be embedded inside the limiting hole 7 of the adjacent battery, thereby increasing the stability of the connection between the two.

[0035] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An improved structure for a lithium battery, characterized in that, include: The outer shell (1) is a cylindrical metal body with multiple axially extending inner protrusions (3) on its inner wall. The battery cell (4) is coaxially disposed inside the outer casing (1), and the outer wall of the battery cell (4) is interference-fitted with the inner surface of the inner protrusion (3); A cap (2) covers the opening of the outer shell (1), and a plurality of inserts (6) are provided on the bottom surface around the perimeter. The inserts (6) are inserted between two adjacent inner protrusions (3). as well as, The limiting block (5) is fixedly disposed on the radial outer side of at least two inserts (6); The top of the outer shell (1) is provided with a limiting hole (7), and the limiting block (5) is partially embedded in the limiting hole (7) and welded and fixed to the outer shell (1); The end of the limiting block (5) extending out of the limiting hole (7) is configured to be inserted into the limiting hole (7) of the adjacent battery.

2. The improved lithium battery structure according to claim 1, characterized in that, The bottom of the battery cell (4) is fixedly connected to the inner bottom surface of the outer casing (1) by resistance solder joints evenly distributed in the circumference.

3. The improved lithium battery structure according to claim 1, characterized in that, The edge of the cap (2) is sealed to the opening of the outer shell (1) by an annular laser weld, and the central area of ​​the cap (2) is connected to the positive electrode tab of the battery cell (4) by spot welding.

4. The improved lithium battery structure according to any one of claims 1 to 3, characterized in that, A fluororubber sealing ring is provided between the outer shell (1) and the cap (2).

5. The improved lithium battery structure according to claim 1, characterized in that, The four limiting blocks (5) are equidistantly distributed on the bottom surface of the cap (2), wherein the extension length of two of the limiting blocks (5) is greater than the depth of the limiting hole (7).

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